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Publication numberUS4381322 A
Publication typeGrant
Application numberUS 06/304,224
Publication dateApr 26, 1983
Filing dateSep 21, 1981
Priority dateOct 28, 1980
Fee statusLapsed
Also published asDE3040485A1, EP0050704A1, EP0050704B1
Publication number06304224, 304224, US 4381322 A, US 4381322A, US-A-4381322, US4381322 A, US4381322A
InventorsDietrich J. Bahr, Marian Briska
Original AssigneeInternational Business Machines Corporation
Export CitationBiBTeX, EndNote, RefMan
External Links: USPTO, USPTO Assignment, Espacenet
Process for producing a sliding layer on the surface of an aluminum-coated record carrier
US 4381322 A
Abstract
To reduce scratches on the aluminum-covered front surface of a record carrier substrate having a back surface covered with a nitrocellulose lacquer, 0.1 to 2 percent by weight of a fatty acid, as referred to the weight of the wet lacquer, is added to the last applied layer of lacquer. When the record carrier is wound into a roll, the aluminum layer contacts and reacts with the fatty acid forming a sliding layer.
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Claims(3)
We claim:
1. A process for forming a record carrier having a sliding layer on an aluminum-coated front surface of a substrate having a nitrocellulose lacquer layer, said process comprising the steps of:
(1) coating the back surface of the substrate with one or several nitrocellulose lacquer layers with from about 0.1 to 2% by weight, as referred to the wet lacquer, of one or several fatty acids being added to the last lacquer layer,
(2) coating the front surface of the substrate with aluminum in a vacuum;
(3) winding the record carrier into the form of a roll, whereby the aluminum layer is in contact with the fatty acid, and a sliding layer is formed by reaction between the aluminum layer and the fatty acid, and
(4) aging the roll for at least one month.
2. A process as claimed in claim 1 wherein the fatty acid is oleic acid.
3. A process as claimed in claim 1 wherein the fatty acid is tall oil.
Description
DESCRIPTION

1. Technical Field

The present invention concerns a process for generating a sliding layer on the aluminum-coated front surface of a record carrier substrate having a nitrocellulose lacquer layer on the back surface of the substrate by the action of one or several fatty acids with the aluminum layer.

2. Background Art

In the German Patent Application No. P 30 07 331.5, now commonly owned U.S. Patent Application Ser. No. 202,548, abandoned, a process has been proposed by the present inventors for at least partially converting aluminum layers into aluminum salts of a fatty acid on an aluminum-coated record carrier, wherein during or after deposition of the aluminum layer, the aluminum, with the vapor of a fatty acid being simultaneously present, is at least partially converted, the degree of conversion being determined by the partial pressure of the fatty acid. It has been proposed in particular to use an oleic acid as a fatty acid, whereby conversion is effected to produce aluminum oleate molecules which are formed on the surface of the layer and which are also deposited therein.

It has been proposed further in said application that the aluminum layer be converted during and/or after coating in a vacuum.

It has been found that in so far as the sliding layer to be arranged on the surface of the aluminum layer and its effect on reducing scratches and traces of abrasion on the surface of the aluminum layer during printing in an electroerosion printer are concerned, the results obtainable by said process are quite satisfactory, but that the low vapor pressure of the oleic or fatty acids in a vacuum, and the short reaction period of the oleic or fatty acids on the aluminum layer, do not permit a sliding layer which is improved still further.

During previous tests it has been found that the papers used as a substrate for known aluminum-coated record carriers obviously contained active components which in the course of time caused the surface of the aluminum layer to react with the materials contained in the paper, so that after a longer shelf life the sliding properties of said surface were excellent. Further extensive tests eventually led to the theory in accordance with Patent Application No. P 30 07 331.5, according to which oleic acid or tall oil, i.e., mixtures of different fatty acids, are made to react on the aluminum layer.

DISCLOSURE OF THE INVENTION

the above-mentioned results in accordance with the previous proposal, which are not fully satisfactory, gave rise to the desire to still further improve and intensify the reaction on the aluminum layer. In accordance with the present invention this is achieved in that, prior to the application of an aluminum layer on the front surface of the record carrier substrate, the back surface of the substrate is coated with one or several nitro lacquer layers, 0.1 to 2 percent by weight, as referred to the wet lacquer, of one or several fatty acids are added to the respective last lacquer layer, and that subsequently after the material has been aluminum-coated in a vacuum, the record carrier material is wound up in the form of a roll, and that the roll thus produced is subjected to an aging period of one month or more. For this purpose, preferably 0.1 to 2 percent by weight of an oleic acid or a mixture of several fatty acids, such as tall oil, are added.

To this end, the paper is front-coated in a conventional manner, preferably using nitro lacquer which, depending upon the requirements, is dyed or pigmented. In addition, one or several layers of a nitro lacquer are applied to the back side, adding to the respective last layer 0.1 to about 2.0 percent of a fatty acid or a mixture of fatty acids. It is of special importance for this lacquer layer to be applied as the last layer in the overall process. As in many cases, aluminum-coated record carriers are lacquered on their back side so that the printed paper is absolutely opaque and prevented from curling up, etc., such a measure can be implemented at no extra cost.

After the front side of the record carrier material has been coated with aluminum, or aluminum has been deposited onto it in a vacuum, this largely oxide-free aluminum layer comes into close contact with the fatty acids on the backside, so that conversion is initiated immediately. As the roll is wound very tightly, this action continues for a long time outside the vacuum chamber. In contrast to the process proposed in the above-mentioned Patent Application, according to which the aluminum layer is converted by means of fatty acids during manufacture, the fatty acid in the lacquer on the back side remains effective many months after manufacture of the paper, so that apart from the formation of a sliding layer, there are a number of long-term reactions, such as surface polymerization, rendering the soap layer mechanically resistant.

It is also pointed out that the lacquer layer below the aluminum layer is not serviceable immediately after the record carrier material has been aluminum-coated, but that curing of the lacquer necessitates a longer shelf life of one or several months of the rolls thus wound. During this time, the fatty or the oleic acids, the mixtures of fatty acids, or the tall oil contained in the lacquer on the back side are permitted to simultaneously react on the aluminum layer.

It has been found that the basic concept disclosed in German Patent Application No. P 30 07 331.5 can be implemented even more effectively by means of this novel process, and that the aluminum layers thus have a much higher resistance.

Patent Citations
Cited PatentFiling datePublication dateApplicantTitle
US2971862 *Apr 26, 1957Feb 14, 1961Nat Res CorpVapor deposition method and apparatus
US3463659 *Oct 22, 1965Aug 26, 1969Oxford Paper CoVacuum metallized paper
US3620831 *Dec 30, 1968Nov 16, 1971Honeywell IncElectrographic recording medium
US3698932 *Jan 25, 1971Oct 17, 1972Olin CorpArticles having a low friction surface and process of making same
US3786518 *Sep 22, 1972Jan 15, 1974Nig Mason LtdElectrosensitive recording materials
US4082594 *Jan 26, 1977Apr 4, 1978Mardon Flexible Packaging LimitedMethod for making a wrapping material
Referenced by
Citing PatentFiling datePublication dateApplicantTitle
US4539227 *Jan 18, 1984Sep 3, 1985International Business Machines CorporationMethod of making a metallic soap layer as a gliding layer on a metallized record carrier
US6926951Apr 4, 2001Aug 9, 2005Sonoco Development, Inc.Laminate for gum packaging
US7026635Jul 31, 2003Apr 11, 2006Energy SciencesParticle beam processing apparatus and materials treatable using the apparatus
US7348580Oct 27, 2006Mar 25, 2008Energy Sciences, Inc.Particle beam processing apparatus and materials treatable using the apparatus
Classifications
U.S. Classification427/179, 427/250, 427/296, 427/333, 427/209
International ClassificationB41M5/24, B32B15/01, G03C1/725, B41M5/26
Cooperative ClassificationB41M5/245
European ClassificationB41M5/24E
Legal Events
DateCodeEventDescription
Jul 9, 1991FPExpired due to failure to pay maintenance fee
Effective date: 19910428
Apr 28, 1991LAPSLapse for failure to pay maintenance fees
Nov 27, 1990REMIMaintenance fee reminder mailed
Jul 25, 1986FPAYFee payment
Year of fee payment: 4
Nov 4, 1981ASAssignment
Owner name: INTERNATIONAL BUSINESS MACHINES CORPORATION, ARMON
Free format text: ASSIGNMENT OF ASSIGNORS INTEREST.;ASSIGNORS:BAHR, DIETRICH J.;BRISKA, MARIAN;REEL/FRAME:003944/0310;SIGNING DATES FROM 19810909 TO 19810918